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Comparison of disk encryption software

Disk encryption software is computer security software that is designed to protect the confidentiality of the data stored on a computer disk by utilizing a technique called disk encryption. Compared to access restrictions commonly enforced by an OS, this technique allows data be to be protected even when the OS is not active, for example, if data are read directly from the hardware. Such software encrypts data stored on a computer’s mass storage and transparently decrypts the information when an authorized user requests it: no special action by the user (except supplying a password or passphrase at the beginning of a session) is required. Some also provide plausible deniability with deniable encryption techniques.